Blood type?

B - for me. I actually work in a hospital transfusion service. As mentioned, if you need blood they will test you before you get the transfusion. Even if you knew your type, we would still do all the testing. Even if we have tested you before, we will repeat all the testing every time.

Sometimes older men tell us their type based on their dog tags, and it's wrong. Happens a couple of times a year or so. A few of them get really ticked off with us over it, like its our fault they're not the type they thought they were. :idunno: